2,033 research outputs found
Algorithm for the large deflection of geometrically non-linear, plane and curved structures
No full textDeveloping standards for autonomonous internet queries between remotely distributed travellers, journey planner services and scheduling dataservices
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Large deflexion, geometrically non-linear finite element analysis of circular arches
No full textThis paper presents the results of an investigation into the geometrically nonlinear behaviour of circular arches. A curved element is used, based on satisfying the condition that the circumferential strain and change in curvature, rather than the displacements, should be simple independent functions of the co-ordinate axes. The analysis was carried out using the linearized incremental method based on the mid-increment stiffness in conjunction with the Newton-Raphson iterative technique. A comparison is first made between the results obtained with this element and those using a simple polynomial shape function. The behaviour of a range of arches is then considered and the results are compared and found to agree well with an analytical method. The results include the behaviour of deeper but still shallow arches which exhibit “looping” of the load-deflexion curve, and bifurcation of the equilibrium path into unsymmetric deflexions of the arch.A computer program was developed to allow any of the generalized degrees of freedom which are designated for incrementation to be expressed as either forces, to avoid failure at the vertical tangent to the load deflexion curves, or as generalized displacements to avoid failure at the horizontal tangent. The program also allows the quantity subjected to incrementation to be changed as necessary to follow complex load-deflexion equilibrium paths.<br/
Practical Issues in prototyping a national, public transport journey-planning system using the JourneyWeb protocol
No full textThis research examined the requirements for multiple travelers to request a local, medium-distance, national, or international itinerary plan from any node of a public transport journey planner system using timetable or schedule data from numerous public transport companies and modes. It was resolved that a four-tier, client-server architecture and a distributed data service would best meet these requirements, using the Internet to exchange trip schedule data according to an agreed JourneyWeb protocol based on extended markup language. The JourneyWeb protocol is explained, and the field characteristics and attributes used in mutual data interrogation between itinerary planning services, allowing the web of services to expand, are defined. Successive iterations of a prototype system, first between two counties and then expanded to include a larger geographic area, demonstrate progress to date using real schedule data
The applications of finite elements to large deflection geometrically nonlinear behaviour of cylindrical shells
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Journey Web:an Internet Protocol for mutual interrogation between local journeys planners providing a national public transport information system
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